Irish ploughman Tom Nixon leads Shire horses Nobby and Heath as they harrow an on-going heritage wheat-growing area in Ruskin Park, a public green space in the borough of Southwark, on 9th February 2018, in London, England. The Friends of Ruskin Park are again growing heritage wheat and crops together with the Friends of Brixton Windmill and Brockwell Bake Association. Shire horses are descended from the medieval warhorse but are a breed under threat. Operation Centaur, which maintains the last working herd of Shires in London is dedicated to the protection and survival of the breed. It is an organization set up to promote the relevance of the horse as a contemporary working animal in partnership with humans. This takes the form of heritage skills in conservation and agriculture, transportation, discovery, learning and therapy.